<!DOCTYPE html> <html> <meta charset="utf-8"> <title>Testcase for 'overflow-clip-box: content-box' (Bug 1226305)</title> <style> .test { overflow-clip-box: content-box; overflow: hidden; padding: 20px; background: green content-box; width: 300px; height: 20px; border: 1px solid; } .test > div { margin-top: -40px; height: 40px; background: red; } </style> <body> <p>There should be no red areas.</p> <div class="test"><div>FAIL</div></div> <div class="test"><div style="width: 200%">FAIL</div></div> <div class="test"><div style="margin-left: 100%; height:20px; margin-top:0">FAIL</div></div> <div class="test"><div style="margin-left: -100px">FAIL</div></div> <div class="test"><div style="margin-left: -100%; width: 100%; height:20px; margin-top:0">FAIL</div></div> </body> </html>